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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b953ed6d4ce08bfe9f86954efe7feaa4a8a1e5ab63eab16aa3eaec2af9c6e496' 
  AND token = 'Uc3WwOcQurzQ21CXCS2XtXufTfufu2jY82Zd0W8Bhbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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