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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4e70ba6271c0f22f8cf400b8ef9a13b7d461af0a366b5a4a1aef717d3c83b30' 
  AND token = 'Eby6/5ICzxleNdDvQ6tEZKFSQkEf5+o4QRs/W3po7Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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