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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e35f57ab4f7772ef335802efe003c9fb38a9f97718e427f3ddcd6d2c616793' 
  AND token = 'H8YqpS07smGMSm48licu7AjrjS3apVcvsd8y5jS/TfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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