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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9ed35de8d27bfe3e67d7d2fb3226bbff9276f76e7abe5a35ce7fcbafded2a43' 
  AND token = 'FCNHdSNVXfkBMer4FO28n9Cr2IzgmTJ51znkdEBiEmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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