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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67d14fd02679ac7056617ad17a15219b6cef9776f7ddcf3cd00c279d6a006d08' 
  AND token = '7AfKsd0z5uknEfWtMUdII+GiS3UE8U0dY6pAAo0FG7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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