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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4e33ca4c56e4ced168c83d243d311051cbcae1773319ed3623c5cb72cf40305' 
  AND token = 'WnYOO5f+Rh0FPHsIjkspBhLNq7kzu2usJkvRPha1zKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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