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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a5b6c600aa80f68a4498844dfc9379c6f076ae5de6e71aab28f59ee1d22ea5e' 
  AND token = 'Sr4kLY2qZ+om+laXY9DNVbMqWwMIQ9QsCG9ZhAS3QQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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