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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '535ec90692bdfe6482fa1c2bafd4c189bd692a907cdba3a5ffa8cf2369e5a41e' 
  AND token = 'xO+zl3SdycVZDtNZF9IYViSreahfWEJXFYGWwhu7viI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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