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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a130b60076f2a182a820a3cf0fabe33fc8d54abc0bbab13a4f550a1216f31c82' 
  AND token = 'sA+C2tAckY6np4/3Tg0BRmSFKHlDjNEigH49qP3vmkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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