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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '395be1419e57bd242b57c35b5819938f220a6f4206917f6c52ea42042c84e8e6' 
  AND token = 'L2N/PZXUHd2p9Hk+HRaDaDiMHrf4qzGQ3WR6Z87WG7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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