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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db7aeb06c59fb42d8f6d10507c91bb33e13628d38a19f518ca464966c24f6b4' 
  AND token = '2WaddY+5Hx30FZtvoFhxy9nAPb7QFuzpONSV9H8FaoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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