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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f736bf96d9e39bc5217208498586a8ba0d46a5ac5c833b437881fd9baa08e9b' 
  AND token = 'BW36ueIsRxA1l2EcDzpvLNRkbhH4r2BdGxzApjQpnnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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