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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15f99f3c23964f9271e8f5df484961ea4446f7a2f7a34fb6f944ffb5dc5fac8d' 
  AND token = 'Q/Z9rFCi6x+zn0CTaXi5R4ZtBJKWXwnShu5mDzm34I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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