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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37b5a86305e6280471b969780c170264b30d7b69e410986ba11047ba97565497' 
  AND token = 'MNW/WMC9LeF6okwRM8vP9R1Zh8RZWRGVJllKKRwOtRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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