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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '456f6065afacab0b9b3e72382a6bcd35c546ec6b03f3ab33f2829e8ec21c2cfe' 
  AND token = 'bFfHRIpvSgXiPnrDIf9WDwr/iJNDjr+APQuhaP4ayL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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