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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f0bb7c4db5d9e756a2531b85d2998cdc501a6eb25fb0029255181a122283ede' 
  AND token = 'hdCQ6BJEHmu0sb0JMKMgFWC6Tgj745jix6IJwRCAHa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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