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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e8ccb4b7e46e4db2bc23de010ee74829e2d56bbe6d44dd030597848b63d816c' 
  AND token = 'mVW2pBvA0bljTNzB8eQF+Z3NwxQUGW+wobdjp8TL8Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}