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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c27938b2b92568def4262a32b432cc964e20492aedf09cd751691a25ceea91d0' 
  AND token = '4t9EUHbbfg+zm3YDkeR/Z4mp51LJcf3jf5aXGFltRhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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