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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '358d26dae1e55f147192617571061847ab2c6284f48eedf270ea38b95a6ab69a' 
  AND token = 'avDB/8xPfPqPFf8wkvZ38j+kjeRpgm4D7iGeQVDk658=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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