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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dba13ff28d05909477631608bf0e9fa9c40c5a617333c5cac149b721e33ef11a' 
  AND token = 'CKPiYiO4Y4Lky9z5PrwlajD84ix/kvAN8ArM2UPI0v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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