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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56036bf3be6a4f3323f6e99f826f85777ae0c2523b8bcc56076f08b6ff6b51ba' 
  AND token = '1Ud7OAr+rg2veGjm9U7GvXkKvuykWWgpvayYIfQ5JQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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