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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0b7105736af5703d5d02404d0a5c882709711a691d9e459adf43e85dae95a79' 
  AND token = 'o70lyR1QjQcNEeHcZs2NYjhCjUZ6PlraP9b0uVYXEh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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