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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1d1b79ba56aa87a12da1d821f35ee4a04c82b9b7c66b6525d910c932114e3cb' 
  AND token = 'FKagfk3013DgLSQpbfGhQ22NYgx8PeNSwleNUm0HLwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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