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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c3ebb24ebf2e9ed26db20300dd993977530f9cb5a9127c9891f129d1d836b33' 
  AND token = '91bV+iFI8ZsmEWi/fIxXQT8p8VdGwhxpSUp3IDZUiv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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