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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cb6e61a13ab1c86e67965e766f6ec2cac0857357154203fd26253878c722aef' 
  AND token = 'CTPLXr/DY9SN1Tsb8eGxcStUpMjFJHMa7rS5jBw0ERY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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