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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a563369bdfd358bc719d46294915935520e9ba48dd75b598c934a904d73ed98' 
  AND token = 'a4DYLDOX0o6aR0LcEokdRsyS9ZTmso3QaYlikygDVyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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