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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '868f7ec7d7e61c6e1fdc7e0c3b63abde531e4ebfbe86cbcecb502462e3e09590' 
  AND token = 'kUTfNN+9Zcdzv7y7iODb6vB1WAFBA0pjdyJClzblqYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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