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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98e6666783d9eaa9c35a92bbc2842c9cab1f7ee84cc7e5c8793251c848a8808' 
  AND token = 'IF0drKrpdlrH7dQ/bCZULTAt+3nfcjTrtsV9B0lFTJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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