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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ae2eb033d7b1f7c212b3a6b1c476f30d00acbaf4f03ed9ec81a944faa7b36fd' 
  AND token = 'UORdhE0qDf+4ARDeqP+ig/cgcqR/1rnJPWZw1vmO3NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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