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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a42656e5ab271f89162d30a2626a3d52670cd8dd8566b722b0200b8741adc1' 
  AND token = 'V6tOt0W6CRoWP4aqg+yqPir1zbhkE87pcXdG38K6ewg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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