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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d00253809e4a83cd2afaa4b0d0a622ba6b1f8a40cae806a168cde798419551' 
  AND token = 'MNNYQua2oqf3uDy13RKQNaHoOwGgJ0lIKJM6VLBF81o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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