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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f850ad04e3ed56a0b7233ec7ce6c312a5c48ba6b63c96d06020046db126eeaf9' 
  AND token = 'NlGnC7aQcnIQaTiXQVJ2UYvIPHHufjzojFWEDxvIk60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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