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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97fe58ebcfa784c4eba7ebbeec1ec287a671bba53319c8643f6f57b6d8ffe7c1' 
  AND token = 'JAfBiaXJb6hxQzNx7/RQweTXOxi4a/FYsbOG7kicWRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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