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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '208d891a2e3e6f63faa502d357cc3daf7368b9ff2490b33dc7fd5fd83dfc5d1b' 
  AND token = 'ZBNJJFVQWtAurWhKIwTcVyPaO3FlXlV9wQ6yLP1buL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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