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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa28ab47c6d2d978b054e3be358cd5455e3f4f4a137b1ce786bbc8fe60b7e7b' 
  AND token = 'jtD0x44LFcdUQBNcrpa1gyZnhZEQ4jEPyf0RPuL7aQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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