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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be3694f50ef11b47e19fd0f38659c8b22f75f9d2ab18bcbc398a247b036fce5a' 
  AND token = 'OwusRNdrwHmAPX1GUqOeLFF/O0U+PP/eotdrNXo8I6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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