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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da9e9603f45f5c4f88b3eae9c1ff9dbfe2668cbfc84902bff4e21331305d8aef' 
  AND token = 'FWRK6JKjvKXn+YYG4mzp+YTuDcZeKSmta5RsubzivyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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