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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caccc030c70d6c07ad3cfae37bd846b7e87c9333ebac866fdbba8e7c0c7ad81a' 
  AND token = 'aKP1J31wxPpBUWYfTGb+TxRsakG3rjT6PWHHE8bGfk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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