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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2903d7e9942a0c6b3866867afebd35ab90b9212dccb8bf28979dffe1defde2f7' 
  AND token = '0kUC0QKpXw1LeojdNgDqjo3qadxn2vgLl/WXdJ4DJVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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