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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3119b9400dbfc3c45933d96f665233e7c35b38a7b4ea947432560abf99b9a96c' 
  AND token = 'pO33qa1+aTX/0OzWW6yFCIsR19ioMcEkCSg6MCUKRok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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