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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f17f279a4d298924301c7348f7d54bde49bf3c6f1c4a62a31487fd139c72a6cd' 
  AND token = 'KWbFV4xDoKv9cQiaoEF7mNk/dhTXIomNKBCm1wSJRm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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