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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98eef6013bff36d19c5c4f9e0434954288c82ff66d7988abfd7b90380a69d09d' 
  AND token = 'O621kJ553n+JNSl090xLIUrsT+77A3/AmTXtR738Yvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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