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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cbfcefd59849a0033046cc8660b152841069f16d95c09aa9a99d344ed534e13' 
  AND token = '6rhIH1PH8sQXpQPCqc4RvFIVKm7Rs0BhCdrrseUu+fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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