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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53ab3849998216aae5f7d083af13234164af83993615f59989159604fc64b186' 
  AND token = 'E3Hx79LJDiCH9aPihx2OJVuqogOXsMm6drVoMc6Am60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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