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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c494543feb0a54133b5dae2bb4550934513bcd3c217b0f5598134e6f7aefd77' 
  AND token = 'y6Bur64h5YQb6R5d9eA/PPutZwR0VimrzphWlrbTNYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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