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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e23c01ea0999621e4d612ddbbeb2c85fbae9bc3d24cd1dc38643c140d1bfef2' 
  AND token = 'zDqpHfkR2Sl1pUZJd1PvlC4w8r+LJbrWCjmn0oo+jvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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