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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae1f868b8f3b7bfca8ade4d2d7b16404225c05f7d806b8e1a5ab540ccfe5ec1c' 
  AND token = 'w1U6bIfRQbgn1V8SaKQV67wduRjdyvydzpaD7tYV3mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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