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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd19879959e7cb6bcf281a64a880847e134dd1748879c1a619f8d6fbd8627cb15' 
  AND token = 'kzHyHcu0KVUQKldFG4/KKV+k7Lr7N1e5ajDUkyR1Cec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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