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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '599336b7ed0fa23dfd263a26cb01faf22253c15aae8c1e604a1dff13e5554320' 
  AND token = 'hB2sjZB4z1oZLLrQw9Z+WdjDDYVRqesFxVksRKdX51Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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