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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '205eeeb3ba125d336ebe618bbbb49eb4506f6c7bba2e8b0b748616090bdf640f' 
  AND token = 'ckgqw6vdfE2CE1+fmWyOyURJIX2h4DkAqD4R9/rImcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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