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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3c61299d7bd4e8f2723ab7a3025c1542689c4bd41b6f929468eda23a2614f20' 
  AND token = 'ubapVYBoZuEYmpEGsKWrPo/eS9jM29tnw0msExnA/y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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